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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88df79451f3c94b45cfc0c5be34b97949c12d1c68e4fcddbe7c1b7019138af65' 
  AND token = 'au7WxkYBHcW48lZDcprNaQadDO6eyWS2F5Zcr90nbus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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