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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd16529dffb0aab43c35eb0c600367d99f51eef2c8b238a699a49dde9d71b6f1' 
  AND token = 'hNIItqW2BeU+2wRsv4VSskY7B0PsWYeCByvw8LEcwyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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