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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63d738fff8aa30152ec9d23a30e82d35b4666c94899f954ec19e200ccdd9fc0' 
  AND token = '7yMUoMzMOoKOhzv4NkxxFjoLbv+EPuR6bALBjSmY/oU=' 
  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