Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8eb4bd16b9dde43ad8e3174000f09b306b9d666fa881ffd88a16be12922410' 
  AND token = 'bVQpE66ZZt4RTNfX72DVU1IfYlmN2CngCb1PSEZIEO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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