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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf8bdfdce8f1fd7b4e4e3a00652960b23a5b325f9fc32f12d620686b005b60f' 
  AND token = 'naHZLjvF3qF3QHoI5wUEiOQ4B12bIUIlQDLBzK1hr9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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