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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd439504ffde155ee43635371f3b835ad2abe2f1ae023cb4265d9004d11512f05' 
  AND token = '8IThq0CCmqqhNssM3ssubcKl4QmxP5WXsqFUl1GKtiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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