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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731ae2ae82cb133d5863d2d93c5fca2744d605386116ac681476e433c75c7fdf' 
  AND token = '1bhPBp6EGWxol5KojmAcGX9cOW90uQAAPE+YUisPsao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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