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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d3e3eb9258c2ff42aaa5bb16514b5041fd23175d4fa55c254debe9dcb67239' 
  AND token = '90DfPXz0yOQLBbsQkUQStl9vN9Bl1J25g+eY0XGHDmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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