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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9416df8802701ef8b290d13fde84c7f4d79a85b60fab3a70833859886032eae' 
  AND token = 'lLYn+eOSVvVehD5j23Ukw60sqo89UiEnk2Qn5Gd6lYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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