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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d6bf65f4848f2ca9b81a52604d893cdedc1ce28d545a4a63c9e82b70592c68' 
  AND token = 'NwCUJk65sI7cW81MljVxuRjiQr/Uh9m4pDzFMhD9ox0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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