SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0980fb6a38c3b09eb466787cc76f55184b2fdfbf5d6e1c062e99fbdc75966b' 
  AND token = 'WYW6zOq9tZZMY45aiGLEeTPQjzj+CG5gntiGgivwwY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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