SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6930989067b5c5e64f6fc5beecbcfb2495c104aa0783485f7faba1c9d4d7d2f6' 
  AND token = 'FV//5GFWFP9DwItM+Aw38XYmvWgrQ+k3F428lN2bDpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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