SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed42c29e98442a5ba4ffcc912dac55410e981aff3bfe4276ede0ee855d26954' 
  AND token = 'NZE/IAUBbUTtbgrLywclQdcWFf2ZwuXoOm+34FTvoXI=' 
  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