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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc57f5b624a99f216b43577465775fdc89aed77811647c0667e0f4e863a707db' 
  AND token = 'qPibEJeTbvIehzUHHzuXjEzntLhZ76/ao+6nF2SKeEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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