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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23e8e9a6f0b76cac5be2cab1796d5fb19790cb3acf5f4180958ccf9f1d03861' 
  AND token = 'QSSdhuPSzTs89j2pipl8A8MJKwPlMqPx3tc8TiuLrR0=' 
  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