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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0faa2ebc828bc9043201fdfa25b2b28683cd063deb496ecc3b3618b813d799' 
  AND token = 'lx0W5lKkjIO6MIOH47fbEABDi6QqZoInrziKgPrjJx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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