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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c0a2f75b0d4ce3fe897150c62231a659aab54de3be528a50fecd4b43b0b5db' 
  AND token = 'Pkt3ZohLrBYcoJLCnwaXl3uYtBpWpVxoKr4PKL7zlzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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