SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe3b80a0bd96416ea7062d2396a0e8c7b2ce65464bb6adea46993cae45db86d' 
  AND token = 'hvMztRtaobgDTDAiGcBf/MdNuSAvwaZnVqIGZvIew+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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