SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c69a38262ad20ad9114ff36bd6c5409d7fe9e99761178178ff242231d3adb6' 
  AND token = 'h/RWY7eXWP75JVUmrlGZNs1nOo0XoNguhXEfERFymfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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