SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb928dd680adba02252412b9cf52a4d60bad43731448694f3323cbf283a003b' 
  AND token = 'BOGmW05iwzwjO/UGz5rJsHbBMpdvAUl/Szk1N8qmPus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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