At that speed heat seizing is less than good. When engine cools off get some oil into it and try it. Some people are born under a lucky star. Unfortunatly for you I feel it was daytime. Hope not.
You are indicating the heat of friction as the likely cause of a very hot engine. All the parts expand until seizure or enough friction is present to bind the engine. Sometimes then a part fails sometimes not. You will know your answer if you can get it started again.
For others. Again one more unfortunate illustration that if you care for your car a low oil pressure warning device is manditory. Especially as these cars get older and older. Even it may not save you but at least you then have a much better chance.
Spend the twenty or twenty five dollars to construct one. Not rocket science and you may well live to regret you did not do it. Many have in the last couple of years alone on this site. Not worth procastinating over either. Strangley enough might even increase the resale value on ebay. Or another example of my crazy inverse logic is without one you may not have anything worth putting on ebay eventually period. So your low oil pressure warning systems cost around twenty dollars but might be worth thousands.