aioauth implements OAuth 2.0 protocol and can be used in asynchronous frameworks like FastAPI / Starlette, aiohttp. It can work with any databases like
MySQL and ORMs like gino, sqlalchemy or databases over simple BaseStorage interface.
There are few great OAuth frameworks for Python like oauthlib and authlib, but they do not support asyncio and rewriting these libraries to asyncio is a significant challenge (see issues here and here).
python -m pip install aioauth
Here you can find an example of OAuth 2.0 server implementation using aioauth and FastAPI: https://github.com/aliev/aioauth-fastapi