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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85487d453eb8fce29c4f0675f955f7347ee1fd76a2bcd63d3e1ddd3dff12f0f5' 
  AND token = '8vtP40EIsKDioRlj7dA/oODrrpP5W42qJ8C/rQa0Dxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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