SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa5e98b55f0796dfc29875c0319c5e7abda9d12a951b5cf27ec3f5bb83d06bc' 
  AND token = 'RzYbIao4JIKTVjZ6WWJ+p1vMaK6GIf4BNvS/mjmVFGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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