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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d98dd6a3b1885a5567de34a50d528faed04eef34923788f24d56e4e6c537c9b' 
  AND token = 'wQQxwX2kwnInBFoPbLQu3cArGndNpZ617kaY5IUAtVU=' 
  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