SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a352b82eae6068856d5dbb23f8dda651289c199913f3925422c2312e991377' 
  AND token = 'hLFn6tjiRSr5J+m0NRDKI3FK7CkGEsPgxMd6JZv+daw=' 
  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