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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce32e473a7ea5f7b22edaf486cc09f74d1840fbe2f69e2616feb75d4bb8f8e28' 
  AND token = '+XkpVJ+FE08NjzcC1XJAeUS35+LMKCdErXCl4hmRM7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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