SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4966baffeeecf4c20fed4bccaa5ca965a903fb7157740275493f5c2632891098' 
  AND token = 'jrPgPmwemV56WjFThsPl/me1X4ckIryxQiCznv0pfDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

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