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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15edcce3c595d3deab0697167db3b6b431a265b0dd54762ff1990e9d55279fdf' 
  AND token = 'qHEXJK7usxNkeXMAHq4f4BiysqAXvF9I0vF7UXgm6rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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