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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6062302673fee09bee5e9f14f8b171698bd356826a7a7d047f994a13834b67' 
  AND token = 'qVfydQ9OCrL+Nzoza5suHR0XGraMxJN1AAJTnYuULss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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