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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98713f1245f550423abe92c0499a776a15f19ea268a79516965536532dd82760' 
  AND token = 'X/HDfh29Vs2j+k/gnSZj8ynfOo2mP7GMDdXEwDMbcio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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