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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb175ce729b7f6bfb52fc1026554ab942941272d9c72acb5c24f6efef24cbc0' 
  AND token = 'reNQjeuu4KyW6RORrHfK8njNwgNGNVcpwqCdG2OZmd0=' 
  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