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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0779c8d22ff6f2be0bb2339a1bf3c0f9e2c972745ff3bd86b580f883f80f19' 
  AND token = 'XWRYkK8uJx41MYFdihKDlOoSR7ryrXdFk2pBOejnbf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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