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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8be791e3569ac98a2612644365a770acb70084c9b6cc06eb42e30b02a5d428' 
  AND token = 'mVwq3lWjN7bdwWuI4uifZoyUWcAXqkese5VwFI16TEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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