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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6717e6870f0885e8a4ec5a2dbe593b91720b36ccfac12a50fc869af595f2e3' 
  AND token = 'V7kJCNa0+64Qr++Ir36otZVaHGPdLkz5/8vo3/AAaxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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