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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7e426c4dea8af82767cfe079d9ab5ed7e7bbcae2190e4d5625200f4f3d3f09' 
  AND token = 'dmqiZOlcZEm8RbZuJ40mluymeNPZqsMglKABdYGuf4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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