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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d132f6cd6d913d25a744049b7f2834c14efa4f5337a187b5beed305553b727' 
  AND token = 'EHHM08sqHBZPkAq5vwXq63FvPpn3MJ2ZshpUnZ8oty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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