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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bcb70bedfcd4071907dd4ec439dc4875270c347c9df25f6c79afb36e6be001' 
  AND token = 'SfuIeVtVAppOb0LYTDZ9CHl6UWUt6OyKADojjED06Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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