Yes, you can filter the records by using the SOQL WHERE Filter attribute of the Lex Lookup component. Follow the steps below:

  1. Go to the records page where you have added the Lex Lookup component.
  2. Click on the Setup icon and select Edit Page.
  3. On the edit page, locate the Lex Lookup component.
  4. On the right-hand side, look for the SOQL WHERE Filter attribute.
  5. Enter your filter criteria and click on Save.

With this setting enabled, when you search for records, only the records that match your filter criteria will be shown.