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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf59323f25dd68fc7f6bed42ecc796faa64c8319f7fb166218d92b88cfa5343' 
  AND token = 'tJeN3LKvLxjVYrzAPeFsUttv3JM8hwEZnceyNRpQr5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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