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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da32d857796fc6f562a3fe912e29965ecad4563abfa7d4bcd65ab4d03a8d65ea' 
  AND token = '+AUirmgiSr6hK8jeArKx2vGjTUiugmZU8yabGHs9AkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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