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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eabcf429a34ce305998c1041e0acf1c8932d9ee48680b957e0610984abd881' 
  AND token = 'M7B0/AfImd/P9/5Sz6vZU8io6Dn+mFkWT/Xqyyy28YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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