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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32965499da039b80b158852be75ea44380a71c038ac266115269a3adfe0f66b' 
  AND token = 'm1vJBytE0C5WmoNudssTXHhVHu9ruCsQQreCcPvEMMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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