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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72688b07751f28e41f1e16d90e4268a897f76103bd162b8a07fb14cd098328ae' 
  AND token = 'r5NAGJq4w9R7RZQfgTJc1xMWsGZASZstI7NvTbPTGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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