SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c2f153006dc088fe66109abe4a05e93d065477f71e27a6fe8b5d8850548a74' 
  AND token = 'XoNrGfG4j/8dhcdpjYm1zKM9UaXY9RmHIQWZBqnolYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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