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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76df28c0f49b5246eb403e640b7211f2ba7ad1fa5b0ffebe3c3abdca985b8ad9' 
  AND token = 'Or/8rV7HkgelQ/5wI1OasJVCrumZJVqOWi0mAlW5TMU=' 
  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