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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8e0a20870189c6067574c678b5088596bc414b53912570534f24536973d73f' 
  AND token = 'TkvE3Tv1/493jZY7N79r9W0WN84eJqvJAr2EZ6otj6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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