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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490383177edb8dc54b06198e2a31227a5c0072fe8ec60106443e9100f4e05920' 
  AND token = 'xDaXGiifC6eVlmE6ZlejUG32aIrETJpgfcYYfizJK1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

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