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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518a2e9c21d92111b724084e9a97779cde225e9f4eaa2b95545a3603dee93998' 
  AND token = 'cr5HivIKRzq92LV1pO3UnMcpD0eJRg8lyPlDXHI/0Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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