SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e419f4e827072775699a4733540d5fb3547df73b5c2df6442fa87ffde87180a8' 
  AND token = 'Ubv9B8FOgtOEgSlvmLKJCuYAE40YugPqc3Doh6hN6FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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