SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1964550926c7e4696584d8e5e3e76067e2ec61bbe6df6ee0c9966d4ce1ac7c69' 
  AND token = 'mWBN6gBzz4Zesbf5ZoUMy02S4FKFPZYISyI9K+dUTO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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