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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcc1277af7bcb5811d00b811d7fe726b6570baad0636c9b5f92e810ff09f40f' 
  AND token = '63AGar6K0WvUTb7bj9Tl7o6f+O1aj/6RaXnQF1X7Z6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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