SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca28e702e110699677d99f0eaa11b5bf59a5a37f693c5f3746ba723002115432' 
  AND token = 'iXR3a47v+ZnNEq2VKhvAIPIpZqmwbinmnfvDdOZzGoA=' 
  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