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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed9edcf9ae673b2db94f05e1dfad1ad9b73af2e901b1efbe5e84653a45ee171' 
  AND token = 'xl3C5zSq3Yw45jk224veWtMoHP6dsNW6lOHoj4xqysk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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