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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf506b00cc094bacbb6e4f1a6c316ad5a5a56cfa0cb3cc80a80cf43dc0175bd' 
  AND token = '7+GYDNKgGJqO1AFje4414eV9vIzPLpoQs+/VOZa4ars=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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