SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5ef012e1314a59a1a90f13720634bd0f4e40e0dba0a2822eb837af2b2568c4' 
  AND token = '+1J2wa1+hRksb3v4FCehAvSwOWJE0NGkEZwDwIWAnMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

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