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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068a4650442674de63e71627639b8127ef21c3044bb06f7b993e0b49740f2c44' 
  AND token = 'S2QfwEnBNCqh2wtRJeASse0QE8iXwIULePfX8XuHWfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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