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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84f9013df125ea6aa356cb8ca68e793ffa69daadf48c99df09e7b99f1a4f3b7' 
  AND token = '9gNpDVc40vlEC7UHnojnzgHDBrVXDEY0+tO90y7AawY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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