SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad3f8514e620354d33137b02d01eb1138df783e35c3995ad39359cff7fe0c7d' 
  AND token = 'G922NjWNMO0pF0Q0HB8T7nM4V5W7s8ErGRMPrY5a/64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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