Tesla charging equipment does not provide any access control. It is plug and go. If you do not have physical access control to the charging station and anyone can drive up and use it, the easiest way is to use a lockable power disconnect. These are very common and inexpensive, but require a padlock. Anything with a keypad or access card is significantly more expensive. If you had a home automation system, you could easily add a remotely controllable electrical disconnect as well.