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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18980dc88540bd49af095734aca4070927c60944d64ee81b46bcc6bdf948c7b7' 
  AND token = '4D0mozaWx+my3UeMsoDTW0pHERvQnjwfa+LUF4lJW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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