SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94461b25f22c9d5a32f44fb8310f71b1783904d516a05ad6fce783fba898d69b' 
  AND token = 'WnsvpUEh/267FQPXzuu5T1e4OJ0L6Xd4c/EaBPi8wRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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