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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b561a8839e77884d696526ca6f9e9e96ab4019f54a9b78eed44fbf42969916c0' 
  AND token = 'HGcr6zy0eTp5puBHiC2yrKa3StTeB6DQ7LUN44sakO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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