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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad1dc4b60bf63f3dba5a3bb1054247b33b1deb5a423f92f8762426e94038aa4' 
  AND token = 'IRFnTtihHzKV5FRj0RdUfXv2ZUiwrNx3VJgXNRehikc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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