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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d35766060ca15525d3c88fca6bcad479abaadac1b5a05c19e7755bc5c7af72' 
  AND token = 'K8nyrz37WFFEQ+623QDdJifNrtMi+53k6tUSNhEkrAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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