SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2210a7315465cb4516d915a06ddc5a5a9caa23b27eda09b0ed6f8d57f1d9676c' 
  AND token = 'B6VMso1TmKddb7z6/XS9eJ+kyxLrR9ZPm61U/hZ1p9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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