SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cfad848a85a1b10538840faeaf9216b075162b94431da765c294de997b30d3' 
  AND token = 'E3bL+KIJBGct6rUS0rpQXHq4PIogU+H9ZCKr0S4jwuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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