SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca196f300ddb76e618bf9e3ae7727054385e764928b7ee4a3a9d26a3ba897ff' 
  AND token = 'XpfQ7zcq0eYCJwuVOOgnyjgIpih3uTHKwG+ll05rz4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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