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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e47f6259488580ad1973cf5601369d49addc2b507dae91c363b2fb642fbedb1' 
  AND token = 'VYteoIqHUBa0XF1aMs3HXc0KLkJS8AxigU7hPInkawo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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