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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb684a288da04378c7192e637d4d20d33fc979efe087706750724a23b9c10c61' 
  AND token = 'Zu9t43/AF9TL8F21sj1RGK2ymTCVE8m8myKDpTE7d3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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