SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10862406adc79317bbc9bd54b0d671f217b7037aa75e48d4c9899d731be7dfef' 
  AND token = 'wYyWPqNSo48VAMuBaGvTZKomUkZvMPUuRFJ/xqQ2nVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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