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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30a2baac3ea02121d282eaa5f98ca8fb488870c1a0ee5c42ada79a5c99fc5ac' 
  AND token = '/WjgBdlwk8ivnL7EUdz/4qoHRKgUSuW4a0B47WNub6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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