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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a49bf0dc7d5c6bed8ba2098142890660e16fb88eeef598cbac6ce2f7f7781a4' 
  AND token = '7Pi1s/0+E9GFP36lJh92Q+v4Rg2wT4fezihJimCwu6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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