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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6516b1a23da7ded104aab38fd3c893cc24cd47f2795a68c7a04eb3e42fe854f2' 
  AND token = 'f7Px6mtgBpUOucIxf1XJTXvyN9HdoNiIK7psBvtKN20=' 
  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