SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85c47545c017f82c9e2d2dfc607e063aa5d04093eb08db71d806a227ef89fb3' 
  AND token = 'Z3yJsXrdPi0YVVMtUvp4UQ+QP6yY/2NBRwfzDcJmgB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}