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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7b3ad4e4e50680d4059aaefc66e1d33e676431303cdd6cee238c1bf898e3fb' 
  AND token = '4W/WjLeJ92r5iFuGH3iXMyk7IR0onZFJpOSDNhBotkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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