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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee7ccfbe8e51db1dfb4fdf702f0eb65a651af2e67caf46ddeac144ef3f8e8cf' 
  AND token = 'omq0y6EsVgOhVjvtNRz1OAURBEEVjVhF1kXzy7GCWxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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