SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19c1619e9fa14b6dd039313924adbf3d8e6a7167e4758284e7bee92628428ff' 
  AND token = 'bJoRzVRJevq6Teok/jfM3Zx5dLuKJk7N+mgHu4HhKYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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