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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d17b7ec72928c01c8e2741b19f3c416dcfc11e5f396e8b3376e9e52846a77f' 
  AND token = '9KOwLFQmXMs4mLZLM0MLmwO0eN/9pWdv9BC8ZKVCFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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