SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8bbedc1e74c5bc812ac38988714b4579046fcc81e6ac9bdc44158f8bc37fe2' 
  AND token = 'VWcIiNl1LJwGRoaFE6p+mIeZLFoZQHD3ssfvJV/cbWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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