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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45167bc9f35ac58fd9ad15a57a11b8b64b8a2e7f4427257fb8f010f53f6f6da' 
  AND token = 'UhxlLMOfSO2WWQ6QiIsEJkUy6emLlf3J1nqZ3nLoRYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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