Several things. There is an inconsistency in package naming so you may want to do:
pip search mysql-connector
to find out what it is called on your platform. I got two results mysql-connector-python and mysql-connector-repackaged.
so try this first:
pip install mysql-connector-python
this may additionally give an error like this:
Some externally hosted files were ignored (use
--allow-external mysql-connector-python to allow).
so finally this should do the job:
pip install mysql-connector-python --allow-external mysql-connector-python