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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f9a5b7e7b31f8480131b97b9b6464d1c40ab065d189ae5374868b2005f1259' 
  AND token = '37whEAAEZEljY4EjATPAcsuCKrdnCxiv3yTH0jxUA3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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