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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037968f7e09fbf7db3e2626cf35732b04111a8be5fc8169848db691225d31f0b' 
  AND token = '5AbYLNQuMeFKqKHgKl1XqhIB2t4CwYzX70N3yp0eX7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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