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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd469da5757cc6f0e5f59e7fb912d73ec34b64b4c242e23f7781849c7d8cd062f' 
  AND token = 'm5CIoX4IoTh7dkinzl8mdJxJoCXfXlzAeHfeX/BWN5Y=' 
  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