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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928accc06f0632ffeebba68c17a7d913f7339ea7eb364c55bf31a6bc9539213a' 
  AND token = 'izShz5vSk6780wkgVAnp8WkM6M0AAj1H38oT1WZny7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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