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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a9109567bb2941e4ca83d8919685f320b0c9b88a6137b919d64a5d891b13fe' 
  AND token = 'Ngu3+TCPrMWZ2zB9/y4zigOXFaIkq3LNa0fryi96SW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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