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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019358a81f54a16f9d0ddf4d045e700b83d5c018a458e7c05277b0fe304a2cf1' 
  AND token = 'hBlkXMAyJWSpDGtGjc5+4N0xbS0L62Lr5ywq74H/DxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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