SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2038445348a9c97110b9a98ca01e94b67a364b5cce4efd4dd6b47c4cad9dc5' 
  AND token = 'qss0I6B/Z29Ozr9rFuFElnbehG2SUFfBS8tNFqihIVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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