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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcf2010f61364456390b964c7a91541cdcf0138af385d0148177a38be70a5d9' 
  AND token = 'bHfzHV1lMrg6GSvuBn138PbT03+LnNdoexPLC4wWwlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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