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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef35ababfc5d3a585dd079a3d72b8207277e44b08ff54cb5e4cf97a57e5ac24' 
  AND token = 'Bumm7Ciuj9WW02ppdwSbEK7gWlTZ7jeK9xcs97NTZ30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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