Manually refreshing the authentication token - External Lookup field API in Custom Forms

Considering the current limitation of manual token refresh, what steps can be taken to mitigate the associated risks and improve the efficiency of the authentication process? 

Currently, we have to do a manual refresh of the token used for authentication. There is no direct way to automatically update the token within the system. Therefore, each time the token needs to be refreshed, it must be manually updated in the Headers field.

This is for the field type, External Lookup, and currently our token refreshes about every 20 minutes due to security but also results in errors. 

Is there a way to avoid this and have this somehow set up using Adobe Fusion?