Go to
https://www.microchip.com/maps :- Select the "MAPS ONLINE" option
Then Micro-controllers
OR skip above two steps and directly go to
https://www.microchip.com/maps/microcontroller.aspx
Then scroll down to UARTS and select the minimum of 2
Then you can narrow down using the other options such as processor family etc.
Uncheck 16 and 32 bit options will give you all the 8 bit devices with 2 UARTS
You can then narrow it down by any other requirements that you may have.