SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16abf118d1d272e1b225d538a99fe90b7e1dfa3eb774b94a9efd3c1052079cdf' 
  AND token = 'xADkcVxTHWpozvvHK/2FOGYddjbPsGUu2FLOvJ+G1wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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