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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7d40b00066a27bb0376e5e028bc8b784e4741daa04f83f722c9b9b64ae9c6e' 
  AND token = 'dLDx1fwfJjZPdZeLnpF8CXOUV/QYo01/HJJP6QpLjW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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