SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff4bf6ce9d6ab5d43ff254b18929b9fa9287cb16dc57cc352f4a35dd0171c75' 
  AND token = 'qbp9gJLKEc6yD9C+Vek8nlJDZP3BiD7mZBgedGWwBb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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