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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0a8575d9dd2d7be348f72a753df66587fef695f05af708e36a7aff358d37b8' 
  AND token = 'SlIhfxvmHKsmWLKkBvIc8bnIuHwvnLFUzoJ3nW4rbLU=' 
  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