SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9b6272a82a26a274f79aaf6ccbe9f8ed5e6aa0215ac3ae2a61261a285a0af0' 
  AND token = 'YZcbe2yMulruU734Ku/lHSLZWXo1pyVnUzFyYfRqRuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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