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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6856ed8e87695c46de0065ff52093360cac879dfaf9bec64d84ed1455a98b380' 
  AND token = 'hEvUB5f9YO8+MdSIJ91o2hk802ZlumgGEmxe1mH/QjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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