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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffef6697d1ccf2d1a95b0ae3fe47bcd017b879ae8b97334a4062316c9047dd2' 
  AND token = '+9mDoCwVVN331KiAg47MOvuJtBuRULhu9rtZKnOicBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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