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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c23ba4c61c9ef05cd6cb8c9802b180f80a91f16a54c3f8266ccc966ab8b5ba0' 
  AND token = 'o7LvtGa5M43iYv3dNLoYOfv4LBXC1pDUW0dqDiuQMzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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