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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2590d77b59cca8cc74898df6af518d2b88a7f67fe399468ddee30e2038615357' 
  AND token = '1GiMg2Iz4DxgEr7FiQ/5lh2ugyu0nQyNl5hMKtdDlhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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