SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a21e089361a5772ada3a01499b67b8e72e2607642648be1bc8ca1b90322027' 
  AND token = 'IEOVe+v3ynE7B0vRds0BESy19WNowGfdEBdUUM3FHsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables