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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c3793d797c7c2555befbc2f83a36cccd101014dfe41a7d8c2d15bd60da6700' 
  AND token = 'hlkG/DdQeCRHDcZCaUSgVl9tS+/wL88bjlru65TN9Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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