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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f6535250183ac8a52471f2222659bccdad35b9e2fb2754ba64834538243832' 
  AND token = '2f3w8z5PyOPgfp2KwsqQBg+lD6Ry4dk6YSQ1+Iyb98w=' 
  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