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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e631e48097adda7f3e8d0ca6f24178004b22835afbcf5566ba1c5ebb6b969651' 
  AND token = 'mWlAt45F8tvuWe92WKQwwEnAwJd27ydpDZBpcU50cQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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