SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7cae47a3a3eae80f21596419f376b5e40ade8b056a8db26a295d6425e98011' 
  AND token = '0sVTHndBTZtaXOi6qjlWd9QQ9faw+f47NQZmmThMrh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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