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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc99f6ec512fbb6a2bfb5a847e76fc88b46be69fe5f1c2ea6382906407b71b4' 
  AND token = '688Z546KCT+qDfijHaeDsIfyGbcZ/MfO5jb51qi4udo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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