Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8162e90b6f2fc9ed29937b9d62c9f8cdd42afd8f7d2b85909dcbe5e43d8a992' 
  AND token = 'xfCoJbAKbKnDDpPGwGg9+Wu7VAec1v+IRizfteUeXmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}